NetworkPkg UefiPxeBcDxe: Fix build error for lastest VS2015 compiler
NetworkPkg UefiPxeBcDxe: Fix build error for lastest VS2015 compiler

The UefiPxeBcDxe module encounters a build error for IA32 arch using the
latest version of VS2015:

UefiPxeBcDxe.lib(PxeBcBoot.obj) : error LNK2001: unresolved external
symbol __allmul

The cause is line 148 in file NetworkPkg\UefiPxeBcDxe\PxeBcBoot.c. The
third parameter for gBS->SetTimer() function is of type UINT64, so the
multiplication should use the MultU64x32() function now.

Cc: Siyuan Fu <eef549df2036636f79f66102b4e2dc444721df8f@intel.com>
Cc: Jiaxin Wu <91f509c31e98a6df13950454fe51aea543223eaa@intel.com>
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <f387b71200577e27ccf5abb090fda0ddd187ec6e@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>

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